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Resend

Communication · Email

Modern email API for developers. Send transactional emails with a clean API and generous free tier.

No Credit CardForever FreeDeveloper Friendly
Duration

Forever

Credit Card

Not Required

Rating

4.4/5 (98)

Geo Restrictions

None

Rate Limits

Requests per Day100 RPD
Other: 3,000 emails/month, 100 emails/day

Free Tier Details

✅ Included

  • 100 emails/day
  • 3,000 emails/month
  • 1 custom domain
  • React Email support

❌ Not Included

  • —Multiple domains
  • —Dedicated IP
  • —Priority support

How to Get Your Free API Key

Create an account at resend.com.

https://resend.com/signup

Add DNS records to verify your sending domain.

Go to API Keys and create a new key.

https://resend.com/api-keys

How to Test Your Key

Send a test email via the API.

curl -X POST https://api.resend.com/emails \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"from":"you@yourdomain.com","to":"test@example.com","subject":"Hello","html":"<p>Test!</p>"}'

Expected: JSON response with email ID.

Hidden Limitations

  • Only 1 custom domain on free tier
  • No dedicated IP (shared sending reputation)
  • Daily limit of 100 emails is strict

Official Links

DocumentationPricingDashboardWebsite

Last verified: 2026-02-09 · Last updated: 2026-02-09